Wyniki wyszukiwania

1

Access of dopamine to the median eminence and brain throughout local vascular pathways in sheep

100%

Skipor J., Wasowska B., Picard S., Thiery J.-C.

Reproductive Biology

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2004

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tom 04

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nr 1

2

Courtship and copulation of Helix lutescens Rossm. (Gastropoda: Pulmonata: Helicidae)

100%

Koralewska-Batura E.

Folia Malacologica

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1998

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tom 06

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nr 1-4

3

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Hormonal regulation of cephalopod reproduction in the light of comparative endocrinology of invertebrates

84%

Pokora Z.

Folia Malacologica

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1999

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tom 07

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nr 4

4

Diurnal rhythm of plasma melatonin level in mares from spring equinox to summer solstice

84%

Rapacz A., Lewczuk B., Prusik M., Ras A.

Bulletin of the Veterinary Institute in Puławy

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2010

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tom 54

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nr 4

The aim of this study was to describe plasma melatonin (MLT) profiles in mares from spring equinox to summer solstice. Two experiments were performed on 19 warm-blood mares: the first in a veterinary clinic and the second in a stable without electricity and located outside a village. In the first experiment, blood samples were collected at 2-h intervals during 50-h periods in March, April, May, June, and July. In the second experiment blood samples were drawn at 2-h intervals for 26 h in March. Plasma concentrations of MLT were measured by direct RIA. The mean plasma MLT level showed significant (P≤0.05) time-dependent changes in horses sampled in March, April, May, June, and July. In experiment I, the mean level of MLT was significantly elevated (compared to the day-time values at 12.00, 16.00, and 18.00) between 20.00 and 04.00 in March, and between 22.00 and 04.00 in April and May, between 24.00 and 04.00 in June and July. Therefore it could be concluded that the duration of the elevated MLT level reflects the length of scotophase, and merits consideration as an important signal in seasonal regulation of reproductive activity. Individual profiles of MLT level were well-entrained in the majority of animals studied in experiment I and in all individuals used in experiment II. The concentrations of plasma MLT varied between mares; however, in the vast majority of individuals, the plasma concentration of MLT was low compared to other mammalian species.

5

Morphological changes in wild boar (Sus scrofa L.) semen in annual cycle

84%

Kozdrowski R., Dubiel A.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2004

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tom 07

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nr 2

6

Condition of sows during reproductive activity depending on lipid metabolism gene (DGAT1) polymorphism

84%

Szyndler-Nedza M., Piorkowska K., Ropka-Molik K.

Annals of Animal Science

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2017

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tom 17

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nr 3

7

Various reproductive strategies of two species of Oligochaeta: Limnodrilus hoffmeisteri and Tubifex tubifex

84%

Zbikowski J.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr Suppl.4

8

Habitat use by phyllostomid bat assemblages in secondary forests of the 'Sierra del Rosario' Biosphere Reserve, Cuba

67%

Mancina C. A., Garcia-Rivera L., Capote R. T.

Acta Chiropterologica

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2007

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tom 09

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nr 1

Using mist-nets, we studied the composition of bat assemblages in four distinct secondary habitats of the Sierra del Rosario Biosphere Reserve, Cuba. For each individual captured we recorded reproductive condition, seeds in feces, and pollen species. Of the 550 bats captured during 41 nights of sampling, 97% belonged to six species of Phyllostomidae, and 88.7% belonged to just three: Artibeus jamaicensis, Phyllonycteris poeyi and Monophyllus redmani. The total number of captures varied among the four sites, being higher in the two more disturbed sites although this may have been an artifact of the use of ground-level mist-nets in vegetation of different structure. However the higher capture frequencies found in these sites could be related to the availability of understory fruits and the less dense understory vegetation too, allowing some species to exploit resources farther from forest edges. On three sites, the captures included a common large frugivore, two common nectarivores, and two uncommon species. The species composition of these assemblages resembled that observed in previous studies in the better-conserved core zone of the Biosphere Reserve. This implies that food availability and vegetation structure might be more important influences than the conservation level of vegetation on the composition and structure of assemblages of Cuban phyllostomids. In spite of the reduced diversity of the assemblage we studied compared with mainland assemblages, the relative abundances of Cuban bats tend to be higher than some continental ones. This could be related to lower bat diversity and a higher degree of gregariousness of the Cuban phyllostomids.

9

Thyroid hormones in the cerebrospinal fluid of the third ventricle of adult female sheep during different periods of reproductive activity

67%

Skipor J., Misztal T., Szczepkowska A.

Polish Journal of Veterinary Sciences

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2010

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tom 13

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nr 4

Thyroid hormones (THs) are obligatory for transition from breeding season to anestrus in sheep. In this process, THs act during a very limited time of the year and primarily within the brain. In ewes chronically equipped for sampling cerebrospinal fluid (CSF) from the third ventricle, we have characterized the concentrations of total and free thyroxine (T4), triiodothyronine (T3), and total reverse T3 (rT3) in the CSF during breeding season, anestrus and during a critical period required for transition to anestrus (December-March). The total T4, T3, rT3 and free T3 average concentrations (± SEM) in CSF were 1.5 ± 0.07 ng/ml, 14.5 ± 1.2 pg/ml, 43 ± 7.4 pg/ml, and 0.6 ± 0.05 pg/ml, respectively, and all were significantly lower (p < 0.001) than in blood plasma except free T4 (12.6 ± 1.1 pg/ml), which was similar to that in plasma. There was a seasonal trend (p < 0.05) in the concentration of total T3 (highest in December) and free T4 (highest in November) in the CSF that does not follow that in blood plasma. During the period of transition to anestrus the CSF total T3/TT4 molar ratio and free T3/ T4 ratio were significantly lower (p < 0.05 and p < 0.01, respectively) than in blood plasma, while the total rT3/T4 ratio was significantly higher (p < 0.01) at the end of this period (March). Additionally, the CSF total rT3 concentrations were also significantly correlated with the CSF total T4 levels (r = 0.57; p < 0.05). In conclusion, the CSF in sheep may serve as a considerable source of thyroid hormones for neuroendocrine events. The lack of significant changes in THs concentrations in the CSF during the period of transition to anestrus indicate that neither seasonal changes of THs circulating in the blood plasma nor THs circulating in the CSF actively drive the transition to anestrus.

10

Inhibition of reproductive activity of codling moth, Cydia pomonella L. [Lep.: Tortricidae] by insect growth regulators

67%

Badowska-Czubik T., Pala E.

Journal of Fruit and Ornamental Plant Research

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1993

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tom 01

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nr 4

11

The rodent community of the Venezuelan cloud forest, Merida

59%

Diaz de Pascual A.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

Ograniczanie wyników

Access of dopamine to the median eminence and brain throughout local vascular pathways in sheep

Courtship and copulation of Helix lutescens Rossm. (Gastropoda: Pulmonata: Helicidae)

Hormonal regulation of cephalopod reproduction in the light of comparative endocrinology of invertebrates

Diurnal rhythm of plasma melatonin level in mares from spring equinox to summer solstice

Morphological changes in wild boar (Sus scrofa L.) semen in annual cycle

Condition of sows during reproductive activity depending on lipid metabolism gene (DGAT1) polymorphism

Various reproductive strategies of two species of Oligochaeta: Limnodrilus hoffmeisteri and Tubifex tubifex

Habitat use by phyllostomid bat assemblages in secondary forests of the 'Sierra del Rosario' Biosphere Reserve, Cuba

Thyroid hormones in the cerebrospinal fluid of the third ventricle of adult female sheep during different periods of reproductive activity

Inhibition of reproductive activity of codling moth, Cydia pomonella L. [Lep.: Tortricidae] by insect growth regulators

The rodent community of the Venezuelan cloud forest, Merida